Fluid motor for wiper apparatus



Dec. 14, 1954 Filed June 21, 1949 F. A. "KRoHM 2,696,805

FLUID MOTOR FOR`WIPER APPARATUS 7 Sheets-Sheet 1 IN1/Emol; FRED A. l0?OHM @Q4/QW ATTORNEY Dec. 14, 1954 F. A. KROHM 2,696,805

FLUID MOTOR FOR WIPER APPARATUS Filed June 21, 1949 7 Sheets-Sheet 2FEED A. KeoHM ATTORNEY Dec. 14, 1954 F. A. KRoHM 2,596,805

FLUID MOTOR FOR WIPER APPARATUS Filed June 2l, 1949 7 Sheets-Sheet 5ATTO NEY Dec. 14, 1954 F. A. KROHM 2,696,805

FLUID MOTOR FOR WIPER APPARATUS Filed June 21, 1 .949 7 Sheets-Sheet 4frm/5 INVENTOR. 03 FEED A. Meo/1M |03 BY M/-Q/Jf ATTO NEY Dec. 14, 195.4F. A. KROHM 2,696,805

FLUID MOTOR FOR WIPER APPARATUS l 38 l INVENTOR.

FEED A. KEOHM ATTOE EY Dec. 14, 1954 F. A. KRQHM 2,696,805

FLUID MOTOR FOR WIPER APPARATUS Filed June 21, 1949 7 Sheets-Sheet 6INVENTOR. FEED A. f/eoHM ATTO RNEY Dec. 14, 1954 F. A. KROHM 2,696,805

FLUID MOTOR FOR WIPER APPARATUS Filed June 21, 1949 7 Sheets-Sheet 7 30Y i 3 l 3 sa @gli l; .ffyp @ai 1N V ENTOR. FEED A. /foHM ATTOR EY UnitedStates Patent l FLUID MOTOR 'FOR WIPER APPARATUS Fredy A. KrohmpGary,Ind., assigner to Productive Inven- `tions, luc., a corporatonfof`Indiana Application lJurre l21,.194`9,Se1'ial No. 100,445

16 Claims. (Cl. 121-97) This invention relates generally to power units,and more particularly,has"to do with a windshield wiper motor of thefluid type.

Anobjectof this :invention is to provide a windshield wiper; motor ofthe iluid'drive type, which may be used for replacement purposes more`readily than 'motors heretoforeavailable 'because of its embodiment offeatures which give it substantially universal zadaptability to thewidely varying dimensional limitations and other conditiouslencounteredin replacing Vfluid drive motors supplied as original equipment forautomotive vehicles.

Such original equipment motors, in part because of the materials andmethods used yin their production, and in part because Iof theirlmechanical features, `deteriorate functionally in service and 'requirereplacement. Within a `fperiod much shorter than the average useful lifeof the automobile in which lthe motor `is mounted such or1ginalequipment motors frequently become almost completely inoperative fromsuch deterioration, which includes as one of its :more importantfeatures, the wearing awa-y vof the Imaterial in :the lraceway Aof thereciprocal vane employedv to propel =the activating shaft yof the motor.`Such wearing away increases steadily and, as it increases, theeflciency `or power of the motor decreases because of the growingproportions of leaks which occur between the vane and theraceway,Efforts to restore lthe efficiency of the motor by installing a new vane'and/or a new resilient'seal between the vane and the raceway are-onlylpartially successful. The installatio'n of a new raceway isnotfpracticed to any appreciable extent because-of mechanicaldifficulties to y-be encountered if attempted within the scope ofthefacilities ordinarily available to a service station `of `the averagetype at which such replacements `are made.

Anothertobject of the invention is to provide a method of adapting alfluid driven replacement windshield wiper motor, without physicalalterations in the internal moving parts thereof, yto varyingperformance requirements of different makes and models of motor vehicleshaving, respectively, different constructions -and arrangements ofoperatively connected windshield wiper arms and blades and of shafts forythe actuation vfthereof, Aand having, respectively, differentvconstructions and arrangements of linkages or other operativevconnections between said motor and said shafts, whereby a `wiper'blade'impelled by said motor -is parke'd'adjacent whichever of the two eX-tremes of its normal stroke may correspond to the original` equipmentpractice peculiar to that particular make and model of `motor vehicle.

One .great impediment to the timely replacement of vacuum -wiper motorslfor :maximum driving ksafety is the great variety of motors required tomeet the great Variety of conditions Iinherent to different makes andmodelsof automobiles. One of the-problems encountered in providinguniversality lin such replacement motors arises from the fact thatonsome fmakes -and models of vehicles, the normal parking position ofthe blade is at one end ofthe stroke while on Aother vehicles it is atthe other end of `the stroke. Heretofore, no Amethod has been knownwhereby, in va single motor, and without alterations Vto its internalmechanism, the'operator of the motor could, selectively and at hisoption, with equal facility lpark the arms and blades adjacent eitherend of the stroke.

A further nove] method residing inthe subjectrinvention involves the useof means controlling the application-of fluid pressures selectively toone side or another of the 2,696,805 Patented Dec. 14, 1954 ICC primaryimpelling member -of the 4motor to cause parking of said member andoperatively related parts adjacent one or the other of the extremes ofits stroke.

`Other -novel methods of 'importance in achieving useful yresults in thesubject invention are apparent in the drawings and specification hereof.

Wear of the raceway becomes of serious proportions usually within two orthree years of usage. When it is considered that approximately 29million of the automobiles and trucks registered at the end of -the year1948 were manufactured before World War Il, it will be understood thatthe need vfor the subject invention has been a-truly serious need.

As will appear hereinafter, besides Nthe wear of the raceway, there areother important deteriorations and losses of efficiency -that develop inthe original equipment type of-fluid drive motors (ordinarily calledvacuum motors) which contribute to the necessity for replacements ofthecomplete motor. Such original equipmentmotors are replaced `each year inVery large numbers running well into kthe millionsof'motors.

Because of frequent model changes by vehicle manufacturers, it khas beennecessary for the manufacturer of an original equipment fluid drivemotor to vary the shape, size and dimensions of various functional partsof such motors to adapt them to a particular model of vehicle. As aresult, there have accumulated over the years in the Vcataloging of suchfluid drive motors, a very large number of models, shapes and sizesnecessary for the `retail service station to carry in stock in orderthat any substantial `percentage of models of automotivevehiclesr'equiring such service may be serviced promptly from the motorinventory `on hand. lt has only been practicable, heretofore, to replacesuch uid drive motors with `motors yidentical in each instance with themotor to vbe replaced and videntical with it as to source ofmanufacture.

Because of the heavy and varied assortments of original equipmentreplacement lmotors yrequired fto be carried in inventory by the retailautomotive outlet, comparatively few of such outlets carry anyconsiderable range of models of replacement motors, and most 4automotiveretail outlets carry none. Therefore, car owners -are disinclined tospend the time necessary to seek out a service station able to give themprompt replacement, and are inclined to neglect such replacement, evenof motors that have lost much of their efficiency, with the result thatthe hazards of driving, are increased not only for the owner of theparticular vehicle so eauipped with incompetent wiper `motors but alsofor others.

As indicated, a `purpose fof the subject invention is to greatly reducethe number of motors required to be carried in retail vand wholesaleyreplacement inventories, so as to encourage and enable a much largernumber of wholesalers and retailers `to 'provide such service. to theend that driving and walking on the streets and highways will becomeless hazardous. j

A further purpose of the invention is to provide a construction for andmethod of throttlina the application of fluid pressures to the motor soas to facilitate control of lthe performance of the motor by theoperator of the vehicle. For example, the manual control devicesordinarily used for starting, regulating, stopping and parking suchmotors are unsatisfactorv in that they permit the abrupt 'cutting off ofthe fluid pressure from normal wiping operations with the result thatthe parking ofthe blade and arm 'often is abrupt and violent, causingslapping of the blade and/or arm against the frame of the windshield ina manner that causes them to deteriorate at an abnormally vrapid rate.As will appear hereinafter, the subject invention prevents suchundesirable labruptness in the control of uid pressure and prevents theviolent overthrow of the blade and arm beyond normal parking limits. Thesubiect invention providesa throttling method and structure whichpromotes cushioning ofthe parking operation.

Another object of the invention is to provide a method of and structurefor manual control of the throttle (which in -turn controls fluidpressure) which lends .itself readily to installation for replacementpurposes and can be adapted, in installation, as well to one as anotherof the positions of the motor with relation to the control memberexposed for manual contact. There are so many di'lTerent positions ofthe exposed manual control member (exposed usually externally of theinstrument panel of the automobile at a point within convenient reach ofthe operators hand) relative to such a variety of interveningobstructions in the way of wires, linkages, etc., disposed in thelimited space available, as to have seriously obstructed all previousefforts to provide a substantially universal replacement for such fluiddrive motors. The subject invention, as will be seen, provides withinpracticable ranges, unlimited adaptability to these varying conditionsand permits ready installation of the motor and the exposed manualcontrol member with a connection therebetween which operates with equaland complete success regardless of the position of the motor withrelation to the position of the exposed manual control member. Theexposed manual control member obviously may be installed in any desiredposition at the top or at the front of the instrument panel, (asindicated in Figure l). The exposed manual control member is readilyadaptable, therefore. to installation in the same position as thecorresponding original equipment member, without the necessity fordrilling a new hole in the supporting anel.

p Another purpose of the invention is to provide throttling mechanism(Figure 26) and control mechanism (Figure 2) therefor which will permitthe parking of the wiper blades adjacent either end of their arcuatestroke, without any alteration in the structure, and entirely at theoption of the operator of the vehicle. This feature becomes important ina replacement motor because some of the original equipment installationspark normally at one end of the stroke while others park normally at theopposite end of the stroke. These opposing characteristics naturallyrequire the use for replacement of a different model and design ofmotor, when replacements other than those identical with the originalequipment installation are not available. Thus the invention removes oneof the further and important obstructions to universality.

A further object of the invention is to remove still another obstructionto universality occasioned by the fact that such original equipmentmotor may have the hollow nipple over which the rubber hose is fittedextending from the motor in a given direction (toward the right-handside of the car, for example) or on another model extending from themotor and in an opposite direction. This makes inconvenient, if notimpossible, the connection of such hose with any motor having suchhollow nipple on a side of the motor opposite to that from which thehose approaches the motor. The subject invention provides a novelconstruction and arrangement of channeling of uid conduit which permitsthe attachment of said hose to either side of the motor so that,regardless of the angle of approach of the hose, it may be as readilyconnected to the motor as if it were identical with the originalequipment motor which it replaces, which construction permits theclosure of the upposite nipple by a rubber cap (as shown in FigureAnother object of the invention is to provide an improved valving devicefor automatically alternating uid pressure (or suction) at oppositesides of the driving Vane. Ordinary devices for this purpose are bulkyand require a space allowance which restricts the lateralcross-sectional dimension of the raceway of the motor, and thusrestricts the over-all power of the motor. Such ordinary valve devicesalso involve the use of die cast parts which are costly-and areinclined, particularly after considerable wear, to develop leakagebetween the surfaces of relatively moving contacting members. Thesubject invention embodies a valving device constructed and arranged toemploy much less costly punch press parts and to provide a subassemblyof thinner structure which permits adding to the lateral cross-sectionaldimension of the motor raceway without adding to the over-all width ofthe complete motor assembly. It will be noted by reference to thedrawings and to the following specification, that the subject valvingdevice creates the Hip or throw of the valve, from one extreme positionto the other, by the use of opposed identical external cams which reactto a common spring, whereby the rate of wear on each of these two camsis approximately one-half of the rate of wear on a single cam if usedfor the purpose, and the spring pressure created by the two opposingcams is balanced so as to avoid unequal urging of the motor shaft whichcarries the dual-faced internal cam. The external cams may be made ofcloth impregnated plastic such as commonly used elsewhere in automobilecams or levers subject to wear, thus to minimize noise of operation.

Another purpose of the invention is to provide a floating valve memberresponsive to fluid suction and thereby held in uniform and constantcontact with the opposing face, carrying terminals of conduits, so thatany tendency to create or permit leakage between the valve member andthe face will be minimized.

Another object of the invention is to provide a drive member 93, asillustrated in Figure 14, for engagement with the motor shaft, saidmember having lugs and 96 projecting through a guide plate andconstructed and arranged to contact and urge forward inner portions ofthe internal cam member so that the over-all degree of arcuate movementof the windshield wiper arm may be varied to suit varying requirementsof different motor vehicles. By this unique method and structure a stillfurther obstruction to universality of design and application ofreplacement windshield wiper motors of the vacuum type is substantiallyeliminated. It will be noted that the drive member, as shown in Figure15, may be shifted and adjusted by a manual control element 203preferably operating in conjunction with an eccentric.

A further object of the invention is to provide a throttling method andmechanism constructed and arranged so that, without alteration of suchconstruction and arrangement, movement of the throttle from its medianposition in either direction will produce reversely a substantiallyidentical performance of the driving vane of the motor.

Another object of the invention is to provide a secondary valve assemblyand mounting plate therefor, which may be assembled separately of themotor, may be installed in the complete motor assembly as a preassembledunit, and thus may be replaced independently of any other replacement,when and if for any reason required to be replaced.

Another object of the invention is to provide a novel construction andarrangement of parts and assembly whereby essential characteristics ofparts may be readily attained by the use of conventional punch pressequipment and processes, thus facilitating volume production. As anexample, it is common practice to die cast the raceway and mountingframe in one pice. Besides limiting the raceway to die cast materials,which are less resistant to wear, this one-piece die cast member must bemade in various sizes and shapes to meet the varying dimensions andlocations of different mounting brackets to which such motor must beattached. This means the costly construction and maintenance ofelaborate die casting dies in various shapes and sizes.

In the subject invention, the raceway housing 1, as shown in Figure 5,is drawn out of sheet metal, preferably aluminum, the frame 3 is formedseparately and may be formed of a different metal such as stainlesssteel, to give greater strength than die cast material or aluminum.Thus, by making this assembly in two pieces a different material may beused in each piece, to obtain in each piece characteristics mostdesirable. The raceway housing is nested in the frame and is preferablyconnected to such frame by the novel method of extruding portions of thehousing in openings provided therefor in the frame, the points ofconnection being located out of the path travelled by the vane.

A number of important advantages are obtained through this noveltwo-piece construction and arrangement of raceway housing and frame. Tomeet the requirements of different locations of mountings it is onlynecessary to vary the dimensions of the frame. Thus all of the racewayhousings of a given size or power category of the motor remain identicaland their production may continue uninterrupted for die changes in theprocesses. This accomplishes substantial savings in cost becauseproduction runs of the raceway housing extend to the sum total of all ofthe motors to be manufactured in that power category.

The rate of wear in a frictional raceway such as is employed in thesubject invention is inuenced by the disposition :of the.:grain oli`thefmetaletoward the :direction of `ftraveloflthe vane, `for example.-By "formingcthe'racewayfas :herein described, 'the .grain fof-thevmetal may 45be disposed atiany .desired 4angle andfthus the durability.of the Yraceway may 'be enhanced. :Die cast `.metal fis relatively:porous and is without uniform grain.`

Ordinary care in handling :of :materials :for production andfzparts inproduction, :provides afsubstantially ysmooth a-ndruniform contactsurface yinthe* vraceway, without applyinga't'inishing operation. Whenthe raceway housing is'formed of aluminum, its. interior frictionalysurfaces manl be chromium-plated' by well-.known methods `which give-ithe raceway a flint-like hardness diflicult Ieven 4to scratch 'with vafile. Thus fthe method and construction and :arrangement Ihereindescribed Yresult in a. motor -raceway lhousing and lframe assembly moredesirable `both from the standpoint .of' (l) Afacilitating 4volumeproduction, and (2) increasing resistance to wear of :critical arts.

p IIt maybe added lthat to attempt by punch press ymethodsto form etheraceway` housing and frame integrally out of one blank would introduceserious problems -ot which no .practicable solution hasfbeenfoundnwithinperm-issible cost ranges'.` It v'will be noted :thatxthe`top marginal edgesxof the raceway housing must be substantially uniformand :true to, permit -a tight seal against the cover to prevent leakageunder vacuum. The raceway 'housingvwhich forms ,-a-partof lthe subjectinvention is readily held substantially true and uniform at edges toywhich such'sea-l is required.` Any attempt .to form thesewtwo piecesintegrally from a single blank would result in a comparatively irregularsurface at the area'of seal. Thus the degree of perfection of lsealrequired for practical results could not be attained, even bysubjectingthepart to so large Aa .number of operations aswould make thecost4 of ythe part prohibitive.

I=t will be noted that :the narrow-top marginal edges of the 'raceway`housing must' conform ,accurately to that portion of thecoverrecessedtfor lthe purpose of receiving. -it in 'sealed relationship. Inperfecting this seal, a thin gasketwusually is employed.

Another -object of the 'invention is to r.facilitate -replacements wherenecessary, Iand to minimize their cost, by; providing detachablesubassemblies which are readily replaceable; such asthe mounting block.`It ywillfbe noted that :on fthisyblock (which, `on account of itsvarious functions and multiple passages may be a die casting) carriesthe throttle yvalveand the valving assembly. By removing Ithis `one`blockw'ith the throttle :and the valving mechanism attached to it,substantially the entire .functional structure ofthe invention may bereplaced-for any of the Ithree elements (throttle, valuing mechanism ormounting block) may be replaced.

Another objectl of the invention is to provide lan `improvedconstruction and :arrangement of-.parking seals 51 and 52, asillustrated -in Figures, 5 ando, lby which the vacuum may be vsealedyagainstl the inner surface of the cover 2 Awhen thevane 12 is inparking position. -It will be noted that two Vdirectlyopposite-resilient cup-like parking seals are mounted, one on eitherside yof fthe vane, Iso -that the vane may be q aarked.-ateitherA end ofits stroke and Ithe'iwiper arms and .bladesmay be parked correspondinglyatteither end of `:their stroke.

Itis obvious that when the Jmotor is made for original equipment of anautomotive vehicle where all `functional and dimensional requirementsare predetermined, those structural and functional features oftheinvention introduced solely to provide universality may be `omitted andtheir cost avoided. For example, only one -vacuum -seal would berequired because the vane would park only-at one predetermined end ofits stroke. Only Ione :hollow nipple would be required, since the vacuumhose would approach always from a `predetermined side.

The outer end of the motor shaft 7 .may `beso con stiucted and arrangedas to be readily adaptable to the type of linkage preferred forconnecting it operatively to the Wiper 4arm and blade.

In addition to the foregoing, one important object of the Vinvention isto provide an improved yprimary valve body having a unique arrangementof passageways and ports by which `the size and weight of the body maybematerially reduced.

A particular object ,of the .invention is to provide a manual controlenthe motor, .independent of the flexible control .unit .on the`instrument panel, so `that the rotationalurange of the motor shaft andthe -vanefor :piston may be varied and predetermined to meetditferentiinstallation requirements.

Another object of the invention -is to -provide ya primaryl valve seatand a valve embodying improved-principles of design -and constructionwhereby it `may be caused to automatically adjust and seal itself with`respect to the seat, including means extending through the valve intothe body for detachably holding the valve in lace.

p A significant object of the invention is to provide Va primary valveand a controlassembly with unique means for operatively connecting thevalve with the control assembly.

Another object of the invention is to providea setup whereby the uniquemeans employed for operativelyconnecting the valveand control assemblytogether may be manipulated to either of two positions forpredetermining the rotational range of the primary valve so that thewiper arm and blade assembly may be parked only at either side of awindshield.

An additional object of the invention is to provide a iilter forfiltering the air admitted into the .chamberzor raceway ofthe motor,including a novelarrangement for securing the filter inoperativeposition.

A significant object of the yinvention is to provide a novel cover forthe secondary valve operating mechanism, the `cover serving a pluralityof uses.

A `further object of the invention is to provide irnproved meansconcealed from view for securing the primary valve body tothe mountingplate.

A still further object of the invention is to provide means forrendering the secondary valve operating mechanism substantially.noiseless Also,.an object of the invention is to provide a system ofvalving whereby the wiper arm attached to the motor shaft may be easedinto a parking lposition and `thereby avoid the objectionable slap of awiper blade against the frame Vof the windshield.

Other objectsand advantages of the invention will .become apparent afterthe description hereinafter set forth is considered in yconjunction withvthe drawings annexed hereto.

.Referring Vto thedrawings, wherein like partsfare fdesignated by thesame-numerals,

'Figure l is a rdiagrammatic fview of an instrument panel assembly of anautomotive Vehicle exemplifying 'a unique valve .control -unit which maybe installed vin `a plurality of Various .convenient positions, two ofsuch positions being illustrated;

Figure 2 is atop View of a vacuum type windshield motor showing thevalve control assemblyoperativelyassociated therewith;

Figure 3 is a view showing acomponent-of the control 11111.12;Y

.Figure 4 is a perspective view of the motor assembly;

Figure 5 Eis a vertical section taken substantially ,on line l5--5ofFigure ,2 showing various fluid `passages and one position o f thevalve vane;

,Figure 6 is a vertical section taken substantially fon line 6-,6 `ofFigure ,2 showing other fluid ,passages zand two different positions ofthe vane;

Figure 7 ,is .a ltransverse section Ataken through apart of the housingand frame showing vhow they are preferably .united `or connected;

Figures 8, 9 and l() are .rear views of the 4motor assembly with`certain parts removed to exemplify various operating positions of an`improved valve operating mechanism including parts of a .unique manualycontrol for such mechanism;

Figure ll `is a front viewof a part ofthe primary valve housingdisclosing the relationship of certain passageways `or ports providedtherein;

Figure 12 is va view, similar to Figures 8 and 9, illustrating differentoperating positions of certain components;

Figure 13 isa View similar to Figure 10 showing different positions of4various components of the valve operating mechanism;

Figure 14 :is an lexploded yview of parts of `the secondary valvemechanism and manual vcontrol therefor;

Figure l5 is an exploded view of those parts of the manual vcontrol forthe secondary valve which are ynormally carried by .the cover plate;

Figures flu and i7 are vertical sections taken through appropriate partsof the motor assembly to illustrate details of construction;

Figure 18 is a front view of a retainer employed for the filter abovereferred to;

Figure 19 is a front view in elevation of a subassembly of the manualcontrol embodying the parts illustrated in Figure l and a dialing setup;

Figure 20 is a vertical section taken through Figure 19, exemplifyingdetails of construction;

Figure 21 is a front View, similar to Figure 19, illustrating differentpositions of certain parts;

Figures 22 through 25 illustrate the cooperative relationship betweenthe manual subassembly depicted in Figures 19, 20 and 2l, and thosecomponents operatively connected with the secondary valve mechanismshown in Figure 14, whereby one may obtain a desired range of rotationof the motor shaft and the vane;

Figure 26 is a top View of a part of the motor assembly illustrating afull operating position of the primary valve;

Figure 27 is a diagrammatic view illustrating two operatingpositions ofthe valve setup;

Figure 28 shows the manner in which parking of a wiper is obtained; and

Figures 29 and 30 disclose modified ways of assembling the primary valvewith its operating lever in order that parking of the wiper arm andblade assembly may be accomplished to meet certain requirements withrespect to installing the motor.

This application is a continuation-in-part of applicants prior copendingapplications Serial No. 83,896 filed on March 28, 1949 and Serial No.92,634 filed on May ll, 1949.

The motor structure exemplified in Figures 2, 4, 5, and 19 of thedrawings includes, among other things, a housing 1, a cover 2, amounting frame 3 permanently secured to the housing, a valve body 4detachably secured to the cover, a primary or throttle valve 5 carriedby the valve body, mechanism or valving device 6 actuated by a drivingshaft 7 for controlling a secondary valve 8, anld a control unit 9operatively connected to the primary va ve.

The housing of the assembly may be designed and constructed as desiredbut, as illustrated in Figure 5, it is comprised of correspondingarcuate spaced apart parallel side walls 10 joined by a substantiallysemi-circular wall 11 to provide a chamber or raceway for a vane 12clamped for rotation with the shaft 7. The junctions between the sideand circular walls are curved as indicated at 13 in Figure 4. Themounting frame and cover are each generally rectangular in shape, theframe 3 having an opening defined by an embracing flange 14 as shown inFigures 4 and 5. The arrangement is such that when the housing and frameare permanently secured together, the curved end portions of the fiangewill at least forcibly engage the housing and the upper marginal edgesof the housing will lie in substantially the same plane as the upperplanar surfaces of the mounting frame. More specifically in thisrespect, the unique method of assembly consists in forcing or pressingthe convex side of the housing into the frame to temporarily hold theparts in a preassembled relationship, whereupon they are permanentlyunited by extruding or forcibly distorting portions of the housingoutwardly into openings provided therefor in the flange 14 of the frameas depicted at 15 in Figure 7. These extrusions are located suicientlyclose to the marginal edges of the housing that thev will not interferewith the actuation of the vane. This simple and permanent lockingarrangement has proven economical to manufacture and assemble andsatisfactory in use.

The sides of the frame, as shown in Figure 16, are provided with concaveseats 16 with tubular bearings 17 and 18 disposed therein for supportingthe drive shaft 7. The bearing 17 is held in place by the valve body 4and bearing 18 by a clamp 19, as shown in Figure 4, the latter beingarranged within a notch 20 provided in the cover and directly connectedto the frame by rivets 21. Clearance notches as illustrated in Figure 16are provided in the side walls 10 of the housing for the shaft 7. Thecover and mounting frame, as shown in Figure 2, are preferably providedwith ears 22 having aligned corresponding apertures through which boltsor other means may be extended to detachably mount the motor assembly onan appropriate part of the motor vehicle.

The frame and cover are preferably constructed of sheet metaland inorder to insure a leak-proof raceway or chamber for the vane 12, thecover is preferably provided with a large rectangular recess 23, asshown in Figure 4, so that a gasket 24 with appropriate cut-outs can beclamped tightly between the upper marginal edges of the housing and thecover, as illustrated in Figures 5 and 6. The marginal edges of thegasket engage the marginal walls of the recess 23 to retain the gasketin place. It will be noted that the cover is provided with a centrallydisposed raised substantially semi-cylindrical portion 25 providing asmaller raceway or chamber for the upper part of the vane. In thepresent construction the housing, frame and cover are constructed ofsheet aluminum, and consequently, from a practical standpoint, it isdesirable to provide good hard travel surfaces resistant to wear for thevane. Although not essential, these hard surfaces in practice have beenobtained by chromium plating.

The valve body 4 may be constructed as desired, but is preferably madein the form of a metal block provided with a substantiallysemi-cylindrical recess 226 of a size to snugly receive the cylindricalportion 25 formed on the cover, as exemplified in Figures 5 and 6. Theear ends of the valve body are preferably secured by concealed screws 27to circular bosses 23 formed on the cover. With this arrangement, theblock valve body is firmly anchored to the cover.

It is essential that the cover be maintained in a true 0r rigidcondition so that the gasket 24 will intimately engage and properly seatagainst the upper marginal edges of the housing and the rectangularrecess 23. Rigidity and stability is imparted to the cover at least inpart by the cylindrical portion 25, rectangular recess 23 and thecircular bosses 28.

The upper part of the valve block is provided with a circular recess 26,as shown in Figure 5, which rotatably receives the throttle or primaryvalve 5 above referred to. As will be pointed out hereinafter, the valveblock is provided with a plurality of passages which communicates Withthe recess 26 and the chamber or raceway and the secondary valve 8. Themanual control unit 9, as shown in Figure 2, serves to actuate thethrottle valve to control the speed or operation of the motor. Parkingof the wipers is also accomplished by proper manipulation of the controlunit as will be pointed out hereinafter.

The unique arrangement of the various passages in the valve body orblock will now be considered. yThe block is provided with a pair of'aligned longitudinal passages 29, as shown in Figure 6, whichcommunicate with the recess 26 by vertical passages 30 disposed onopposite sides of the center of the recess. The opposite ends of thelongitudinal passages are preferably enlarged to receive nipples 31 and32 in order that a flexible conduit may be connected to either of thenipples in the manner above described. More specifically in thisrespect, if the installation requires that a conduit 33 extending fromthe source of suction be connected to nipple 31, the other nipple 32 maybe closed by a detachable rubber cap 34 as shown in Figure 2, and viceversa.

As illustrated in Figures 16 and 27, the block is provided with anL-shaped vertical passage 35, the upper end of which communicates withthe circular recess 26 at a port 36 equally spaced from the verticalpassages 30, and its lower end connects with a center hole 37 providedin a mounting plate 38 for the mechanism 6, as shown in Figure 9. Theblock as shown in Figure 5, is also provided with a generally Z-shapedpassage 39, one end of which communicates with the circular recess 26 atport 40 and its other end communicates with the charnber or racewaythrough the port 41 provided in the tubular screw 27. A passageway 42,similar to and aligned with passageway 39, communicates with thecircular recess 26 at port 43 and a port 44 provided in the othertubular screw 27. As viewed in Figure 26, it will be noted that thealigned passages 29 are arranged substantially parallel to the passages39 and 42.

The valve block is further provided with a passageway 45, as shown inFigure 26, one end of which communicates with the circular recess 26 ata port 46, and its other end with an aperture 47 provided in themounting plate 38 and spaced apart from the hole 37, as shown in Figure27. A passageway 48, similar to passageway 45, communicates with thethrottle valve recess at a port 49 and an aperture 50 provided in theplate 38 and spaced apart from the hole 37, the hole 37 and apertures.47.l andi` 50 being operatively related'to the secondearyf'valve:8,.as.shown..in Figures 8, 9. and, 1G..

Cup-like. resilient sealsi and 52. are securedz'to the. opposite.. sidesof the vane 2.3.- by.y suitable brackets. and fastening means 53,asshownin Figure 5. Attention. is directed to the fact. that. the.diameter of .eachseal. is somewhat less than the diameter ofthe bossesZtiformed on: the. cover 2 so that, for. example,. the end ofseall willengage the under iiat surface of boss 28 to close the port 41 providedin the cover .at one side of. the. vane, andthe corresponding edge ofseal. 52. will.. similarly engage a. boss/ro close .the portk 44.

The mechanism 6, as illustrated. inliignresv 9v and l0, carried by themountingv plate 3.8 embodies improved principles of design andconstruction and will now be described.

Thev mounting. plate and mechanism. 6y are. preferably` associatedtogether to constitute a subassembly` whichmay be readily detachablyconnected tothe motor block. by screws 54, as shown inrFigure 13.Asillustrated` in Figures 11: and 1.6, thev valve block is preferablyrecessed at; SS. Thecover. and frame. are also provided with recesses toreceive the upper extremity of the mounting plate 38. With. thisarrangement, the subassembly is firmly interlockedwith the valve block.This isv important from. the standpoint of maintaining, the hole.3"iandy apertures 47 and 5.0 inthe mounting plate in. rlegistry with the.passageways 35, 45. and 48respective y.

.The mountingplate is providedwith-.an aperture which receives theshaftbearing 17, as shown in Figure 1.6. As illustrated-in Figures .8,9,10,12 and.13pivots 5.6 extend transversely through themountingplate 38-and pivotally support a pair of corresponding rocker arms. 57 and 58 formaintaining. a cam member orkicker 59, rotatable on. the shaft 7, inpredetermined rotative positions in order. that the fluid intended tocirculate. through certain. of4 the passages will. not. be interruptedexcept at predetermined intervals.. This cam, member. may be constructedas desired, but, as. depicted, in Figurev 14, it is preferably made. bystamping. same out of .sheet metal stock to provide a notch formingapairof spaced apart substantially parallel abutments 62 and 63 adjacent oneside of. the member, and an.- interruption adjacent its opposite side toform a. pair of spaced marginal edges 64 and 65. The inner face. ofmember` 59 is. provided with rearwardly extendingz walls to; form.generally V- shaped cams 66 and 67.. if found. desirable, thesev camsmay be constructedinthe form of. pins. The upper ends of the rocker arms57 and 58r are continuously yieldably.` urged into engagement. with thecams 66 and 67 by a helical expansible spring 68 carried. by'lugs 69 onthe; lower ends of the arms. The upper end of the rocker arm 57 isprovided' with a notch: 70, a. rounded abutment 7.1, andan abutment 72adjacent thepivot 56.

The: rockerv arm 58 is similarly provided. with a notch 73; and.abutments 74 and 15.` t

An. elongatedoscillating member 7.6, carrying .the secondary.- valve 8,is also rotatably mountedj on.. the vmotordrive shaft 7 (see. Figures.14 andl 16). This oscillating member is provided with an upper headportion' having a slot 77 therein which loosely yreceives the'valve 8.The body of the valve. is of. hollow construction. and includes aangev78 which. is disposed between the oscillating member andthe front faceof the mountingplate in order to prevent escape. of the valve. Thisvalve is operable to alternately place the hole37 in the mounting platein communication with first one and then the other .of the apertures47`and Sti-as illustrated in Figure 27.

The oscillating member is provided with notches .79. and? 802 adjacentthe head portion and its other extremity or tail portion.y 81 isprovided withl a rubber bumper 821 in the form of a sleeve. surroundingthe tail. The tail is preferably notched as. shown so that portions ofthe sleeeve or tube will recedefinto thenotches to automatically lockthe tubey in place; Theupper marginal ends of the cams 66 and 67are-adapted to periodically engage the notches "79 and 80to flip theoscillatingmember. If found desirable, the. construction may be modifiedso that the lower marginal ends yof. the.y cams willperiodically'engage. the tail 81 atther same timel that .the upper. endsof thev cams engage the-notches 79 and 80, or: the lower endsmay act toflip the oscillatingmember inrlieu:of'theupperends. The oscillatingmember is. also providedf'with': a central tubular portion Sii-which;preferably` engages; the end of shaft, bearing- 17. to. maintain.`

themember inpredeterminedspaccd operativerelationship;to:the1pants.tolbe engaged thereby. ltwill be. noted that:thetubular portion 83 rides on the larger cylindrical.: .portion` oftthe.. shaft. 7 whereas the cam member 59.

rides on. af reducedcylindrical portion S4 and engages `the shoulder 8Sbetween such cylindrical. portions for predeterminingthe position of thecam member.

The adjustable means;A on the. motor whereby any required rotational.range or movement ofthe motor shaft.

andivaneor piston may be obtained isunique in, character and will now bedescribed. A round guide plate 8,6.,

as shown in Figure 14, rotates with the shaft by reason.

of an oblong .center openingl 8.7 in the plate which re.- cerves thereduced oblong end 88. ofthe shaft, The periphery of this. plate ispreferably interrupted by a pair of diametrically opposed correspondingslots l89v whichy arewarranged in alignment with the oblongopening 87.A, resilientmetal washer 9.0 may be mounted.

provided with a central straight slot 94v which receives.

the pin 92. This driver is also provided with a pair of rearwardlyextendingA diametrically opposed lingers 95 and 96 adjacent itsperiphery which are of a suficient length to project. through the slots89 in the guide plate 8,6, and withinger. between the abutments 62. and63 on the cam member 59 and finger 96 .between the spaeed-marginaledges64 and 65 adjacent the lower edge or side of sucht cam member. A smallmetal spring washer 97 is preferably mounted on the shank of the pin 92and: bears against the outer surface of driver 93 and theunder side ofthe head of the pin 92 in order to assist in-pressing the driverrearwardly and maintain the various parts ,of the actuating mechanism inproper assembly. The Vshank of the pin 92 is detachably held in theaxial hole `91 `of the shaft. by a cover or shield 9S,.as shown inFigure 15, so that removal of the cover will permit disassembly of theactuating mechanism carried by the shaft 7. The driver is furtherprovided with a curvedaslot 99V dened by an upper marginal arcuate edge100 of a predetermined radius and a lower arcuate marginal. edge 101 ofVa different radius and the ends of the.

curved slot terminate in yabutments 102.

Movement of the driver 93 to obtain a desired range of rotationalmovement of the motor shaftmay be accomplished in various ways but ashereinillustrated, its movementis. preferably controlled by Vmanuallyrotating a knob 203 carried by the cover 98, as shown in Figure 1-5.This knob is attached to the cover by a rivet 202 which extends ,throughthe knob and cover and also through a driver or eccentric 103 anchoredfor rotation with'tlie knob. As shown in Figures l5, 19 and 20 theeccentric, including an actuatingelernent 104 and a resilient washer105,A are interposed between the front wall of the cover and the front.wall of the knob. It will be noted. that, the washer bears. against theknob and the actuating element for vthe purpose of obtaining s uflicientfrictionto maintain. the parts in position after they havev been.adjusted. The actuating element is providedV with a circular aperture106 which rotatably receives the eccentric and is further provided witha pair of diametrically opposed rearwardly extending lugs 107 and 10S.The longer lug 107 projects through a vertical slot 109 in .the coverand into the curvedslot 99 of the driver 9,3 and the shorter lug 108extends into a clearance 110, the latter being diametrically opposed tothey slot 109. With this. unique. arrangement, the driver 93. is adaptedfor movementv only in a plane parallel` to the guide plate andtransverse tothe-longitudinal axis of the motor shaft andthe. actuatingelement is limited to a generally vertical and swinging movementIparallelY to the cover and substantially transverse tothe longitudinalaxis of the rivet 202. The knob may be; provided with an arrow or mark`1 11 andthe cover with a dial. 112 indicating various degreesofrotation for the motor shaft. They actionsresulting from adjustingthecontrol knob 203 to various positions. will be described more` indetail` subsequently.

The shield. 9S covers the valve operatingmechanism 6j landincludes aborderflange-IIS which is adapted to bear against mounting .plate 3.8and: a lower. inturned finger 114 which extends under-and rearwardly ofthe plate. Screws 115 received in the outer internal threaded ends ofscrews 54 serve to detachably secure the shield 9u 1n place. 'the frontwall of the shield as stated above, is adapted to be engaged by therivet pin 92 to retain parts or the secondary valve operating mechanismin proper assembly.

'lne primary valve 5 may be constructed in various ways but as hereinillustrated, is preferably made round and of neoprene or some otherdesirable resilient material that will tend to automatically adjust andseal itself with respect to its seat. A metal lever having a round fiatportion 116, as shown in Figures 4, and 6, is interlocked with the valveand includes an offset tab 117, the latter being provided with anopening which is adapted to receive a connector 118 attached to theinner end of helical flexible control member 119 constituting acomponent of the manual control unit 9. A plate 120 overlies the valve 5and engages the valve block and holds the valve and lever assembled inthe valve recess 26. A pivot screw 121 extends through plate 121i, leverand valve and into the valve block. As exemplified in Figure 29 of thedrawing, the interlock between the lever and valve is preferablyaccomplished by providing the upper side of the valve with a pluralityof raised or elevated portions, including a round central portion 122having diametrically disposed radial portions 123 and 124 andcorresponding arcuate portions 125 and 126, all of such portions beingreceived in clearance openings in the lever having shapes correspondingto these portions.

rlhe throttle valve 5, as shown in Figure 27, is provided with a tubularcenter core portion 127 and its underside with an annular recess 128surrounding the core. When the motor is in operating condition asexemplified in Figure 27, the passages 29 leading to the vacuum supply-means and passage 35 leading to the secondary valve 8 will be placed incommunication with the annular recess 128 through ports 30 and 36,respectively. The valve is further provided with a pair of separatecorresponding arcuate recesses 129 and 130 disposed substantiallyconcentric to the annular recess 12S. Attention is directed to the factthat the annular recess is provided with diametrically disposedconnecting recesses 131 and 132, which will be described more in detailsubsequently. The annular recess is at all times in communication withthe passages 29 leading to the vacuum means. Attention is furtherdirected to the fact that these recesses substantially correspond inshape and size with the raised or elevated portions 122 through 126provided on the upper surface of the resilient primary valve 5.

As clearly illustrated in Figures 13 and 16, means are provided forfiltering air which is introduced through the apertures 47 and 50provided in the mounting plate 38 leading to the interior of thehousing. The cover 98 is adapted to bear relatively tight against theouter face of the mounting plate to provide a substantially fluid-tightconstruction so that any air that is admitted into the housing orraceway through the apertures in the mounting plate will have to passthrough the filter. The filtering means may be designed and constructedas desired but as illustrated in Figure 18, includes a receptacle 133having a bottom wall 134, end walls 135, and a back wall 136. The endwalls 135 are provided with upwardly extending continuations 137. Theend walls 135 and the continuations 137 are adapted to embrace the sideedges of the mounting plate and the upper transverse marginal edge 138of the back wall may engage the frame 3, as shown in Figure 16. Thebottom wall 134 is adapted for disposition between the lower marginalend of the mounting plate 38 and the inturned finger 114 of the cover 98in order to retain the receptacle 133 in place. A piece of felt 139 orthe equivalent is normally firmly held in the receptacle 133 and whenthe receptacle isY in place as just described, the felt will bemaintained in position over one or more holes 140 provided in the lowerextremity of the mounting plate 38. lt will be noted that the lowerextremity of the plate is slightly offset inwardly, the purpose of whichis to provide clearance for proper movement of the actuating spring 68.The hole 140 is provided in this offset and the latter also assists inslightly compressing the felt so that any air admitted to the hole 140will be required to pass through the felt to filter the air and preventthe admission of any foreign i'ratter into the raceway. Attention isdirected to the fact that there is a relatively loose fit between thereceptacle 133 and the mounting plate, the purpose of which is to permitthe air to seep or flow into the receptacle. lf round desirable, theback wall 136 of the receptacle may be provided with a projection 141whereby to assist in maintaining the receptacle in proper assembly withthe mounting plate.

Referring again to the flexible manual control unit 9, as depicted inFigures 2, 4, 17, and 26, the opening in the tab 117 includes a slot 142so that the reduced portion 143 of the connector 118 may be received inthe slot and the tab 117 will be held between abutrnents 144 provided onthe connector. With this arrangement, a detachable easily workablecoupling or connection is established between the flexible controlmember 119 and the tab 117 of the primary valve 5. The connector 118 ispreferably of a diameter not in excess of the diameter of the exiblemember 119 in order that the connector will pass through threadedapertures formed in the legs 145 of a fitting 146 secured to the valveblock 4 by a screw 147. The flexible member threadedly engages thethreaded apertures and is of such a character that a knob of 148adjacent its outer end may be disposed in any location on the instrumentpanel desired for convenient operation, for example, at the top or frontas illustrated in Figure l of the drawing. Attention is directed to thefact that the valve block is provided with a threaded opening 149 sothat the fitting 146 may be connected to another part of the blockdepending on the hook-up of the control means 9.

The outer end of the flexible member as illustrated in Figures 2 and 3,preferably carries a tubular bushing 150 having an enlarged end 151provided with a set screw 152 for detachably securing the bushing to theflexible member. A anged exteriorly threaded bearing 153 is secured tothe reduced portion of the bushing by flaring outwardly the inner end ofthe bushing at 154 in a manner to permit relative rotation between thebushing and bearing. The bushing and bearing are adapted to extendthrough an aperture provided therefor in an instrument panel 155 withthe flange of the bearing engaging the front surface of the panel. Awasher 156 engages the rear side, and a nut 157 engages the bushing tolock the parts to the panel. The knob 148 is secured to the enlargedportion 151 of the bushing by means of a screw 158 which extends axiallythrough the knob and is threadedly received in the threads formed by theflexible member 119. An annular recess 159 in the knob is enlarged at160 in order that the set screw 152 may extend therein to further makecertain that the knob will rotate with the bushing. The knob is providedwith a pair of knurled annular portions 161 and 162, one of which islarger than the other.

The manual control unit 9 provides means whereby the throttle or primaryvalve 5 may be accurately controlled to govern at least one phase ofoperation of the motor. The operation of the motor and parking featuresthereof are comparatively simple and will now be described.

As stated above, the annular recess 128, as shown in Figure 26, formedin the under side of the throttle valve 5 is at all times incommunication with the vacuum means. When the throttle valve 5,secondary valve 8 and the various components of the mechanism 6,including the vane 12 are in the positions illustrated in Figures 5 and28, the motor shaft will be held against movement to operate a wiper armand blade, this being due to the fact that the recess 128 is notconnected with the port 36 in the motor block leading to the hole 37 inthe mounting plate through passage 35, and when the secondary valve iscarried over to the position illustrated, the passages 39, 45, 35 and 48will be vented to the atmosphere through the aperture 50 in the mounting plate so that vacuum is created through port 44. More specifically,when the throttle valve 5 is in such position, the recess 128 will beplaced in communication with the port 43 which connects with port 44 inscrew 27 through passage 42, all of which will cause the cup seal 52 tobe drawn intimately against the boss 28 and thereby maintain the motorshaft 7, and the wiper arm and blade operatively connected thereto, in aparking position until the valve 5 is moved to place recess 128 incommunication with port 36, as illustrated in Figures Maand-'27, in:which.- event the. secondary valve 8 will becaused; to oscillate and;connect ports and` passages toactuate vthe vanei The`v cup seal 52 alsoserves to preventseepagelof air fromtlre raceway or chamber into theport: 414 and further ac ts to cushion the parking stroke of the vane.;

Moreover,` itA will be. noted .that when the. vane is in the: parkedposition as` above described and illustrated 1n Figure 51,. variouscomponents` of the actuating. mechanism will; assume predeterminedpositions., More spef cically in-.this` respect andas viewed in Figurel0, cam 66. of. member 59 will be caught in the notch 70 or rocker` arm57 and cam 67-will be caught between notch 8.0' on the headportion ofoscillatingmember 76 and the abutment 74 on the` upper end` of rockerarm 58, and that'therubber. bumper 82 on the, tail portion ofthe osecillating member will engage the abutment 75 on this rocker' arm.,Whenever the throttle valve is moved by the manual control unit 9 sothat the recess 128 takes a. position opposite to thatA illustrated inFigure 28, the recess 132. o recess 128'will be located between ports 36andy 49 in thevalve block, and the seal 51 on vane 12. will be drawnagainstthe other boss 2S to close the port 41. provided,4 in the otherscrew 27, so that depending on thehook-up or installation of the motorthe'vane will be parked in a position directly opposite to thatillustrated in Figure 5. When so parked the aperture 47 in the mountingplate will be exposed to the atmosphere and passage 39l connected tovport 41 in the screw and port 4l)A in the block will be placed incommunication with the vacuum vthrough recess 128 which is at all timesconnected to the vacuum. Also the cam member 59V and oscillatingmember76 will assumereversed positions with the cam 67 in notch 73 of rockerarm 58, cam- 66 caught between abutment 71 at the upper end of rockerarm 57 and' notch 79 of member 76, andy the bumper 82 on theoscillating. member bearing against abutment 72 on the rocker member 57.This rubber bumper serves to eliminate noise.

To operate the motor,l the throttle valve 5 is rotated to the positionillustrated. in Figures 2, 26 and 27 by theillexible member 119 toconnect the annular recess 128, which is at all times in communicationwith the vacuum, with port 36 through recess 132, port 36 leading tohole 37 in the mounting plate 38 through passage 35, thereby connectingthe secondary valve 8 with hole 37 and aperture 47 in the mountingplate, aperture 47 with port 46 through passageway 45, port 46 to port40 through arcuate recess 1.29 in the valve, and port 4t) to port 41 inthe screw v27' through passageway 39, to establish a through line of'communication from passage 29 to secondary valve 8 and port 41 to causethe vane 12, previously in the parked full' line position in Figure 5,to be pulled to the left, as exemplified by the dotted lines in Figure6. The moment the secondary valve 8 is ilipped from aperture 47' by theactuating mechanism 6 to cover aperture 50 in the mounting plate,communication will be established between port 44' in screw 27 and port43 through passageway 42, port 43 to port 49 through arcuate' recess 130in valve 5, port 49 to aperture 5t) through passageway 48, aperture 5hto hole 37 through valve 8, hole 3.7 to port 36 through passageway 35,and port 36 to ,passagesA 29 and the vacuum through annular recess 1128`to cause the vane to move back to the right as exemplitied in Figurey 6.This oscillating movement of the vane will of course continue until thevalve 5 is rotated to a parked position. Attention is directed to thefact that'sincethe secondary valve 8 is in communication with thevacuum, it will be drawn toward the mounting plate and-its ange 78 willact as a seal as it slides over the outer faceofthemounting plate. It isof course to be under stood; that when ythe valve 5 is` in the operatingposition just referred to, the shaft will be oscillating at itsmaximum'speedl To reduce the rate of oscillation, it is merely necessaryto move the valve 5 in a direction to reduce the volume of the suctionat the ports 41 and 44 provided in the: screws 27. The recess 131communicating with the annular recess 128 is preferably V-shaped so thatthe passagesof air between recess 128 and either of the ports 40 and 43leading to passages 39 and 42 may be easily regulated, and so that thewiper arm and blade assembly maybe eased or slowly moved to the desiredparking position.

As briefly described above, the driver 93 movable with thejshaft7 serves-to oscillatew the cammember 59 relative determined:.-position, thespring 68 under. compression will cause the rocker arms to snap the cammember against the oscillating member 76 which carries the sec-.ondaryfvalve 8. More particularly, the guideplate86. is keyed to the.shaft 7. and; thev driver 93 to the, plate by means of. the lingers 95,yand 96 extending through. the slots 89. Sincethe driver moves with theshaft thetnger 9S. on the driver will. alternately engagethe spacedabutments 62v and:l 63- on. the cam member. Assuming that theVoscillating member 76-has been tlipped` toi place the secondary valvein, the position illustrated; 'in Figure;- 8; to cause the vane tobepulled toward the left, thecams 66V and V67 on member 59 will` bevlocated as shown; in Figurey l0. As theshaft '7., guide plate 86,driver'93, and v ane 122rotate clockwise-the oscillating member; 7 6iandcam member 59 will remain stationary until the upper tinger or lug onthe. driver 93 engages the; abutment 63 on the cam member as shown inFigure 9, whereupon the cam member isrotated alongwith the driverAcausing the cam 66 to move out, of thefnotch- 7,0 in= the rocker arm 57and cam 67 to` ac t` againstl abutment 74- on,` ,afm 58. This movementof ,thel cam member 59 causes` the upper extremities`l of the rockerarms tol spread apar-tV ordiverge and compress the spring'68 as viewedinFigure` 13, and the instantthe cams ride over the abutments 71 and 74and'beyondcententhe arms will snap the cam 66- on member 59 againstthenotch 79 on the oscillating member 7,6 to cause the latter to` ip.over -so that the secondary valve 8k will cover hole 37 and aperture 50as shown by the dotted linesV in Figure 27, after which the vacuum willcause the vane to be moved back to the right in a counter-clockwisedirection. When the hole 37. and aperture 5t) areV so covered, the cam67 will be seated in notch 73 of rocker arm 58 and cam 66 against theabut,- rnent 71 on arm 57 and rubber bumper 82 against abutment 72 on.arm 57. As the shaft 7, driver 93, guide plate S6 and vane 12 travel inthe counterclockwise di rection just stated, the oscillating member 76and. cammember 59 will remain stationary until thenger 95 onl the driverengages the abutment 62 on member 59` where-- upon the member is rotatedalong with the, driver causing the cams 66 and 67' to urge the upperextremities of the rocker arms 57' and' 5S outwardly to compress thespring 6,8 and the instant the cam member 59 is moved past center, itwill be thrown to snap cam 67 against the notch 80 of the oscillatingmember 76 to flip; the latter back to a position where secondary valve 8will againcover hole 37 and aperture 47.

lf found' desirable, the parts could' be so designed and constructedthat the lower finger 96 on the driver would engage the lower marginaledge 64 on the cam member at the same. time that nger 95 engagesabutment 63 and the same applies with respect to the marginal edge 65'and abutment 62, or the arrangement may be such that the lower finger 96will alternately engage the edges 64 and, 65 in lieu of the nger 95engaging abutments 62' and 63.

It is to be noted that the points of engagement between the nger 95 onthe driver and the abutments 621and'63 on the cam member are adjacent tothe base of the notch which forms the abutments 62 andv 63 and arerelatively close to the axis of the shaft 7.

As stated above, one of the important objects of'thc invention is toprovide a unique arrangement whereby the range of rotational movement ofthe shaft and vane may be varied, within practicable limits, to meetdiierent installation requirements. Thus, one motor equipped withl themanual control of the subject invention 'exemplified in Figures l5, 16and 19 through 25 may be installed in any one of a considerable numberofV different types, makes or models of automotive vehicles. With such amotor, the replacement setup is improved as described at the beginningof this specification. This manual control is operable independently ofthe control 9l and as pointed out above is preferably primarily carriedby the cover 98 shielding the secondary valve actuating mechanism.

This manual control may be operated by merely'manipulating the knob 203.When, for example, al particular installation requires that the motorshaft oscillateA within the maximum range of l2() degrees, the knob willbe located so that the arrow 111 thereon will register with the degreemarkon thecover as illustrated in Figure 19, in which position, theupperv finger 9 5 on the driver will be located as` shown inFigures 8,9, 12,` 22 and 24 and the upper lug 107 on the actuating element 104will be arranged adjacent tothe lower marginal arcuate edge 101 of thecurved slot 99 in the driver. If, for example, the installation requiresthe minimum range of 80 degrees, the knob will be turned to place thearrow opposite the 80 degree mark as illustrated in Figures 2l, 23 and25, 1n which position the nger 95 on the driver 93 will be located agreater radial distance from theaxis of the shaft 7 and consequently,such finger will alternately engage the outer extremities of theabutments 62 and 63 to cause the driver, guide plate and vane to travela shorter rotational distance than when the control is set for `amaximum range. This difference in rotational ranges 1s due to the factthat the driver is adjustable with respect to the cam member so that thefinger 95 may, within practicable limits, be moved to any one of anumber of infinite radial distances from the shaft axis to obtain arotational range within 80 to l20 degrees as illustrated. It will benoted that the faces of the abutments 62 and 63 are arranged at an anglewith reference to a line passing through the fingers 95 and 96 on thedevice so that the upper finger 95 will travel a shorter circumferentialdistance to engage the abutments when located farther away from theshaft axis as shown in Figure 23 than when closer as depicted in Figure22. Obviously, the cornponents employed to obtain the rotational rangesjust referred to may be modified to obtain a range less than S degreesor in excess of 120 degrees.

When the installation requires that the motor should function to rotateits shaft and a wiper arm operatively connected thereto within a rangeless than the maximum, the knob will be rotated so that the upper lug107 on the actuating element 104 will forcibly engage the upper marginaledge 100 of the curved slot 99 provided in the driver 93 to move thefinger 95 on the driver outwardly whereby the finger may alternatelyengage the abutments 62 and 63 on the cam member. The finger 95 may bepulled back to obtain the maximum rotational movement of the shaft, bymanipulating the knob so that the lug 107 will be drawn against thelower marginal edge 101 of slot 99. T he straight marginal edge of theopening 110 in the cover 98 provides a stop for the lower lug 108 of theactuating element 104 but it is to be understood that other meanssuitable for the purpose may be employed to limit movement of theactuating element when operated by the eccentric 103. The opening 110also provides clearance for the lug 108 in order that the actuatingelement may be pivoted by the eccentric 103 and at the same time sliderelative to the cover 9S. As pointed out above, the

upper and lower marginal edges 100 and 101 of the curved slot 99 are ofdifferent radial dimensions and as a consequence, the marginal edges arelocated closer together at a point substantially in alignment with thelingers 95 and 96 and straight slot 94. Accordingly, the space betweenthe marginal edges at such point is of a size to accommodate the upperlug 107 of the actuating element in order to hold the cam member andactuating element assembled to obtain proper mechanical adjustment andmovement therebetween. This manual control assembly has provensatisfactory in use and provides means whereby the rotational range ofmovement of the vane may be readily varied before or while the motor isin operation although in the majority of installations the control willbe set for a predetermined range prior to installation. This manualcontrol is entirely independently operable of the control unit 9.

It is to be understood that the scale or dial may be omitted and theadjustment may be made after the motor is installed, connected and readyfor service-in which event the positions of the windshield wiper bladewith relation to the windshield frame determine visually what theadjustment should be.

It will be noted that as wear, stretch or other abnormal conditions inthe transmission mechanism between the motor and the windshield wiperblade develop so as to create slop permitting the wiper arm and/or bladeto slap the windshield wiper frame objectionably when the wiper is inoperation, this control may be adjusted to shorten the rotational arc ofthe wiper blade to prevent such slap. This is a rather prevalentcondition affecting certain original types of installation.

Figure 30 of the drawing exemplifies a modified way of operativelyconnecting a primary valve 300 with an operating lever 301. In thismodification, the tab 302 of the lever is offset approximately at a 15degree angle with respect to a line passing through the center of thevalve and raised or elevated portions 303 and 304 thereof. With thisarrangement, the lever may be assembled with the valve as illustrated topredetermine the travel or movement of the valve and lever assembly inone direction depending on one installation. The construction alsopermits assembly of the lever with the valve in a reverse or alternativeposition as exemplified by the dotted lines, so that the travel ormovement of the valve may be predetermined for a different installation.In other words, the valve and lever of this modified construction may beassembled to meet various installation requirements. ln this connection,attention is directed to the fact that the valve body is provided with anotch 305 as illustrated in Figure 4, which limits the rotationalmovement of the valve by reason of the fact that the abutments 306formed by the notch may be engaged by the tab of either lever.

Having thus described my invention, it is obvious that variousmodifications may be made in the same without departing from the spiritof the invention, and, therefore, I do not wish to be understood aslimiting myself to the exact forms, constructions, arrangements, andcombinations of parts herein shown and described and dened in theclaims.

I claim:

l. A windshield wiper motor comprising a housing, a cover secured to thehousing, a throttle valve body carried by the cover, a valve in thebody, a manual control for the valve, a mounting plate carried by saidvalve body, a shaft having a portion supporting a vane in the housingand having a portion extending through the mounting plate, valveoperating mechanism mounted on the plate, a secondary valve actuable bysaid mechanism, passageways provided in the valve body leading to thethrottle and secondary valve, a driver associated with the shaft forholding the mechanism on the shaft, a member adjacent the driver, andmeans movably supported on the member for adjusting the driver.

2. A fluid motor comprising a chambered housing, a movable piston insaid chamber, a shaft carrying said piston and extending exteriorly ofthe chamber, a throttle valve and a secondary valve carried by thehousing, mechanism spaced apart from the piston for operating thesecondary valve, passages communicating with the chamber, said valvesand said passages being constructed and arranged whereby when thethrottle valve is connected to a vacuum and moved in one position, thepiston and s'naft will be caused to travel back and forth within apredetermined path in the chamber, means operative in conjunction withsaid mechanism for controlling the range of the travel of the piston andshaft, and manually actuated means connected with said operative meansfor actuating the latter, said connection being independent of saidshaft.

3. In an oscillating fluid motor assembly, a housing, a piston operablein said housing, passageways in said housing, a shaft mounted on saidhousing and oscillated by said piston, a reversible valve disposedadjacent said shaft and slidably disposed over said passageways, a cammember rotatably mounted on said shaft and having diametrical opposedcam faces, said cam member being adapted to actuate said valve, a drivermovable with said shaft and adapted to actuate said cam member, rockerspivotally disposed on opposite sides of said cam member and adapted toengage the respective cam faces of said cam member, resilient meansassociated with said rockers whereby to urge said rockers toward saidcam member, a shield covering the cam member, a manual control carriedby the shield and having a part extending through the shield forengaging the driver to cause the driver to actuate the cam member in amanner whereby the oscillating range of the piston may be varied.

4. A iiuid motor comprising a housing, a piston vane operable in saidhousing, passageways in said housing, a shaft mounted on said housingand oscillated by said piston vane, a reversible valve cooperable withsaid passageways, a cam member rotatably mounted on said shaft andadapted to actuate said valve, a pair of abutments on said cam member,spring pressed means bearing against the cam member, a driver having aprojection for alternately engaging the abutments to move the cam membera predetermined distance whereupon the spring pressed means will causethe cam member to snap the reversible valvewith respect to certainpassageways, a support, a manual control member carried by the support,an actuatlng element having a lug extending through the support andcooperable with the driver, and means movable with the control memberfor actuating the element to cause its lug to move the driver so thatthe projection thereon may be disposed at different radial distancesfrom the shaft to engage the abutmeuts at various points whereby theoscillating range of the shaft and vane may be varied.

.'5. A fluid motor having automatic valve mechanism disposed to occupyeither one of two operative positions for controlling movement of ashaft carrying a vane, said automatic valve mechanism including anoscillating part and being operably responsiveV to the movement of saidVane, an element movable to shift said oscillating part, pressuremembers mounted in opposed relation for movement with respect to saidelement, spring means urging said pressure members so that said eiementmay be 'rapidly moved ahead when beyond a predetermined position,resilient means for cushioning the movement of the oscillating part, adriver, and means whereby the driver may be manipulated `to engage theelement at an innite number of points so that the movement of the vanemay be varied when desired. v

' 6. A iiuid` motor having automatic valve mechanism disposedto occupyeither one of two operative positions for controlling movement of adriving vane forming a component thereof, said automatic valve mechanismincluding an oscillating part and being operably responsive to themovement of said vane, a cam member movable to shift said oscillatingpart, cam pressure members mounted invopposed relation for movement withrespect to said cam member, spring means urging said cam pressuremembers so that said cam is snapped against the oscillating part whenmoved beyond a predetermined position, a support provided with anopening, an actuating part on one side of the support, a movable memberengaging the actuating part, a knob member for actuating the movablemember, a driver part arranged on the other side of the support, meansextending from one of said parts through the opening and cooperatingwith the other part, means for maintaining the members and partsassembled so that manipulation of the knob member will cause the movablemember to move the actuating part in order that the extending means willoperate the driver part to cooperate with the cam member in a mannerwhereby the travel of the vane may be varied when desired.

7. A valve operating mechanism for a fluid motor comprising a mountingplate, said plate having an aperture, a shaft rotative in said aperture,a middle port provided in the plate, two additional ports spaced awayrespectively at either side of said middle port, an oscillatorrotatively mounted on the shaft, a hollow valve controlled by theoscillator and arranged to cover alternatively the middle port and oneor another of the outer ports, a cam member rotatably mounted on theshaft, a pair of opposed spring urged members adapted to bear againstthe cam member, and an element carried by and movable with the shaft forengaging the cam member, the construction and arrangement being suchthat when the cam member is moved beyond a predetermined rotativeposition the spring pressed members cause the cam member to snap aheadof the oscillator to rapidly move the valve forwardly, said elementbeing adiustable to engage the earn member at different radial distancesfrom the shaft axis whereby the arc of rotational movement of the shaftmay be varied as desired.

8. A valve operating mechanism for a fluid motor comprising a mountingplate, said plate having an aperture, a shaft in said aperture, a middleport provided in the plate, tivo additional ports spaced awayrespectively at either side of said middle port, an oscillatorrotatively mounted on the shaft, a hollow valve controlled by theoscillator and arranged to cover alternatively the middle port and oneor the other of the outer ports, a cam member rotatably mounted on theshaft, a pair of opposed spring urged members mounted on the plate andadapted to bear against the cam member, and an element movable with theshaft to engage the cam member when the shaft is rotated, theconstruction and arrangement being such that when the cam member ismoved beyond a predetermined rotative position by the element the springpressed members will cause the Cam member to act against the oscillatorto rapidly move the valve to its opposite extreme, said element beingadjustable to engage the cam member at diiferent radial distances fromthe shaft axis whereby the rotational arc of the shaft may be Variedwhen desired. v

9. A valve operating mechanism for a uid motor comprising a mountingplate, said plate having an aperture thereon, a shaft rotative in saidaperture, a middle port provided in the plate, two additional portsspaced from each side of said middle port, an oscillator rotativelymounted on the shaft, a hollow valve carried by the oscillator andarranged to cover alternatively the middle port and one or the other ofthe outer ports, a kicker rotatably mounted on the shaft, a pair ofopposed spring urged members bearing against the kicker, an elementengageable with the kicker, the construction and arrangement being`such'that when the kicker is moved beyond a predetermined rotativeposition by the element the spring pressed members will causeithe kickerto act against the oscillator to rapidly move the valve forwardly, saidelement being adjustable in a direction transverse to the shaft axis forengaging the kicker at one point to obtain one range of rotationalmovement of the shaft and at another point to obtain a different rangeof movement, and a guide for said element.

10. A uid motor comprising a housing provided with a chamber, a shaftsupported on said housing, a vane carried by the shaftand disposed inthe chamber, automatic valve mechanism disposed to occupy either one oftwo operative positions for' controlling movement of the vane, saidautomatic valve mechanism including an oscillating part and beingoperably responsive to the movement of said vane, an element movable toshift said oscillating part, pressure members mounted inopposedfrelation for movement with respect to said element, spring meansurging said pressure members so that said element may be rapidly movedahead when beyond a predetermined position, a driver, and means wherebythe driver may be manipulated to engage the element at an infinitenumber offpoints sov that rotationalmovement of .the shaft may be variedwhen desired.

ll. A valve assembly for fluid motors comprising a valve seat, anoscillatable shaft, a valve pivotally mounted on the shaft foroscillatory movement on the valve seat, means for arresting the movementof the valve, a lost motion adjustable actuating means mounted on theshaft for oscillating the valve and for controlling the arc ofoscillation of the shaft, resiliently connected rocker arms pivotallymounted on axes at opposite sides of and parallel to the axis of theshaft operably engaging said actuating means for accelerating themovement of the valve with a snap action, and manual means operablyengaging the adjustable actuating means for selecting and maintainingthe arc of oscillation of the shaft within a predetermined range.

l2.` A valve device for fluid motors, saiddevice comprising a bodyprovided with passageways terminating in ports, an oscillatable shaftmounted on the body, a valve pivotally mounted on the shaft foroscillatory movement for controlling the flow of fluid through theports, means for arresting movement of the valve, adjustable actuatingmeans mounted on the shaft for oscillating the valve and for controllingthe arc of oscillation of the shaft, resiliently connected rocker armspivotally mounted on axes at opposite sides of and parallel. to the axisof the shaft operably engaging said actuating means for accelerating thevalve with a snap action, and means operatively connecting the actuatingmeans for maintaining the arc of oscillation of the shaft Within apredetermined range.

13. A valve device for uid motors, said device comprising a bodyprovided with passageways terminating in ports, a mounting plate securedto one side of the body and provided with openings registering with saidports, an oscillatable shaft mounted on the body and extending throughthe plate, a valve pivotally mounted on the shaft for oscillatorymovement for controlling the ow of uid through the openings, means forarresting the movement of the valve, adjustable actuating means mountedon the shaft for oscillating the valve and for controlling the arc ofoscillation of the shaft, resiliently connected rocker arms pivotallymounted on 4the plate on axes at opposite sides of and parallel to theaxis of the shaft operably engaging said actuating means foraccelerating the valve with a snap action, a support adjacent theactuating means, and means carried by the support opera- 1:9 tivelyconnecting the actuating means for maintaining the arc of oscillation ofthe shaft within a predetermined limited range.

14. A fluid motor comprising a chambered housing, a movable vane in saidchamber, a shaft carrying said vane and having ends extending exteriorlyof the chamber, a throttle valve and a secondary valve carried by thehousing, actuating means adjacentone end of the shaft yfor operating thesecondary valve, passages communicating with the chamber, said valvesand said passages being constructed and arranged whereby when thethrottle valve is connected to a vacuum and moved in one position, thevane will be caused to travel back and forth within a predetermined pathin the chamber and when said throttle valve is moved to another positionthe vane will be caused to park beyond the normal operating path of thevane, a support located apartfromthe shaft and means carried by thesupport cooperable with the actuating means whereby the rotationalmovement of the vane may be varied.

15. A uid wiper motor for a motor vehicle comprising a housing, aprimary throttle v alve carried by and communicating with the housing, apiston movable in the housing, a shaft operatively Aconnected to thepiston and extending from the housing and adapted for connection with awindshield wiper driving assembly, an enclosure carried by the housing,secondary -valving mechanism disposed within the enclosure, saidsecondary valving mechanism including a reciprocating member operativelyassociated with the shaft, abutment means disposed within the enclosureand movable to abut said reciprocating member of said secondary .valvingmechanism whereby to alter the range of travel-thereof, control meansconnected to said abutment means, said control means extendingexternallyrof the enclosure whereby to permit adjustmentof said controlmeans readily by the driver of the vehicle while said-wiper motor is inoperation.

-1-6. A uid wiper motor for a motor vehicle comprising a housing, aprimary throttle valve carried by and communicating with the housing, apiston operable within a predetermined range in the housing, a shaftoperativelyconnected to the piston and extending from the housing andadapted for connection with a windshield wiper driving assembly", anenclosure carriedby the housing, secondary valving mechanism disposedwithin the enclosure, said secondary valving mechanism including anelement operatively associated with the shaft and including a valve forcontrolling uid communication with the piston, means movable intooperative association with the element whereby to alter the operatingrange of said shaft and said piston, and control means connected to saidmovable means and extending externally lof the enclosure whereby topermit adjustment of said control-means readily by the driver of Ithevehicle.

References Cited in the le'of this patent UNITED STATES PATENTS NumberName Date 1,426,049 Dinwiddie Aug. 15, 1922 1,502,729 Lippert July`29,1924 1,563,758 Lindberg Dec. 1, 1925 1,693,665 Phillips, Jr. Dec. 4,1928 1,738,311 Oishei et al Dec. 3, 1929 1,853,758 Brumm Apr. 12, 19321,969,094 Rappl Aug. 7, 1934 2,075,959 Previti Apr. 6, 1937 2,173,357Dall Sept. 19, 1939 2,260,853 Hueber OctE 28, 1941 2,302,109 Dodge Nov.17, 1942 2,344,913 Ager Mar. 21, 1944 2,348,492 OShei `May 9, 19442,438,380 Arens Mar. 23, 1948 2,483,150 Olson Sept. 27, 1949 2,602,430Bell July 8, 1952 FOREIGNY PATENTS Number 'Country Date 697,976 vFranceNov. 5, 1930

